Use of time programs in automation of steam turbine starts
In automation of starts of present day high-capacity steam turbines of thermal and nuclear power stations it is occasionally advisable and occasionally necessary to use time programs of variation in main parameters. Time programs should be constructed on the basis of technological investigations of the turbine as a unit to be automatically controlled with allowance for contingent deviations of actual boundary conditions of warming up of the ''critical'' elements from the design conditions or for variation in these boundary conditions in service. The principles developed for compiling time programs of variation in main parameters of automated starts make it possible to realize transient processes, close to the theoretically optimal, at any arbitrary pre-starting state of the turbine by means of fairly simple automatic units. In particular, it is advisable to use the programs in the form of a linear dependence of the rate of variation in controlled parameter on the quantity being assigned for automated increase in temperature of steam supplied to the turbine of generating units of thermal stations and for loading the turbines of generating units of thermal stations and for loading the turbines of nuclear stations. In this case the initial level from which a parameter increases at controlled rate is assigned in the form of an analog dependence on the pre-starting state of the turbine. The arrangements for temporary acceleration of transient processes after forced pauses in carrying out a program make it possible to optimize transient processes with the deviations, typical of service, from continuous performance of the initial program.
- OSTI ID:
- 5319277
- Journal Information:
- Therm. Eng. (USSR) (Engl. Transl.); (United States), Vol. 26:8; Other Information: Translated from Teploenergetika (Moscow); 26: 8, 466-470(1979)
- Country of Publication:
- United States
- Language:
- English
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21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
NUCLEAR POWER PLANTS
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210000 - Nuclear Power Plants